// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/environment.h"

#include <memory>

#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

typedef PlatformTest EnvironmentTest;

namespace base {

TEST_F(EnvironmentTest, GetVar)
{
    // Every setup should have non-empty PATH...
    std::unique_ptr<Environment> env(Environment::Create());
    std::string env_value;
    EXPECT_TRUE(env->GetVar("PATH", &env_value));
    EXPECT_NE(env_value, "");
}

TEST_F(EnvironmentTest, GetVarReverse)
{
    std::unique_ptr<Environment> env(Environment::Create());
    const char kFooUpper[] = "FOO";
    const char kFooLower[] = "foo";

    // Set a variable in UPPER case.
    EXPECT_TRUE(env->SetVar(kFooUpper, kFooLower));

    // And then try to get this variable passing the lower case.
    std::string env_value;
    EXPECT_TRUE(env->GetVar(kFooLower, &env_value));

    EXPECT_STREQ(env_value.c_str(), kFooLower);

    EXPECT_TRUE(env->UnSetVar(kFooUpper));

    const char kBar[] = "bar";
    // Now do the opposite, set the variable in the lower case.
    EXPECT_TRUE(env->SetVar(kFooLower, kBar));

    // And then try to get this variable passing the UPPER case.
    EXPECT_TRUE(env->GetVar(kFooUpper, &env_value));

    EXPECT_STREQ(env_value.c_str(), kBar);

    EXPECT_TRUE(env->UnSetVar(kFooLower));
}

TEST_F(EnvironmentTest, HasVar)
{
    // Every setup should have PATH...
    std::unique_ptr<Environment> env(Environment::Create());
    EXPECT_TRUE(env->HasVar("PATH"));
}

TEST_F(EnvironmentTest, SetVar)
{
    std::unique_ptr<Environment> env(Environment::Create());

    const char kFooUpper[] = "FOO";
    const char kFooLower[] = "foo";
    EXPECT_TRUE(env->SetVar(kFooUpper, kFooLower));

    // Now verify that the environment has the new variable.
    EXPECT_TRUE(env->HasVar(kFooUpper));

    std::string var_value;
    EXPECT_TRUE(env->GetVar(kFooUpper, &var_value));
    EXPECT_EQ(var_value, kFooLower);
}

TEST_F(EnvironmentTest, UnSetVar)
{
    std::unique_ptr<Environment> env(Environment::Create());

    const char kFooUpper[] = "FOO";
    const char kFooLower[] = "foo";
    // First set some environment variable.
    EXPECT_TRUE(env->SetVar(kFooUpper, kFooLower));

    // Now verify that the environment has the new variable.
    EXPECT_TRUE(env->HasVar(kFooUpper));

    // Finally verify that the environment variable was erased.
    EXPECT_TRUE(env->UnSetVar(kFooUpper));

    // And check that the variable has been unset.
    EXPECT_FALSE(env->HasVar(kFooUpper));
}

#if defined(OS_WIN)

TEST_F(EnvironmentTest, AlterEnvironment)
{
    const wchar_t empty[] = L"\0";
    const wchar_t a2[] = L"A=2\0";
    EnvironmentMap changes;
    string16 e;

    e = AlterEnvironment(empty, changes);
    EXPECT_EQ(0, e[0]);

    changes[L"A"] = L"1";
    e = AlterEnvironment(empty, changes);
    EXPECT_EQ(string16(L"A=1\0\0", 5), e);

    changes.clear();
    changes[L"A"] = string16();
    e = AlterEnvironment(empty, changes);
    EXPECT_EQ(string16(L"\0\0", 2), e);

    changes.clear();
    e = AlterEnvironment(a2, changes);
    EXPECT_EQ(string16(L"A=2\0\0", 5), e);

    changes.clear();
    changes[L"A"] = L"1";
    e = AlterEnvironment(a2, changes);
    EXPECT_EQ(string16(L"A=1\0\0", 5), e);

    changes.clear();
    changes[L"A"] = string16();
    e = AlterEnvironment(a2, changes);
    EXPECT_EQ(string16(L"\0\0", 2), e);
}

#else

TEST_F(EnvironmentTest, AlterEnvironment)
{
    const char* const empty[] = { NULL };
    const char* const a2[] = { "A=2", NULL };
    EnvironmentMap changes;
    std::unique_ptr<char*[]> e;

    e = AlterEnvironment(empty, changes);
    EXPECT_TRUE(e[0] == NULL);

    changes["A"] = "1";
    e = AlterEnvironment(empty, changes);
    EXPECT_EQ(std::string("A=1"), e[0]);
    EXPECT_TRUE(e[1] == NULL);

    changes.clear();
    changes["A"] = std::string();
    e = AlterEnvironment(empty, changes);
    EXPECT_TRUE(e[0] == NULL);

    changes.clear();
    e = AlterEnvironment(a2, changes);
    EXPECT_EQ(std::string("A=2"), e[0]);
    EXPECT_TRUE(e[1] == NULL);

    changes.clear();
    changes["A"] = "1";
    e = AlterEnvironment(a2, changes);
    EXPECT_EQ(std::string("A=1"), e[0]);
    EXPECT_TRUE(e[1] == NULL);

    changes.clear();
    changes["A"] = std::string();
    e = AlterEnvironment(a2, changes);
    EXPECT_TRUE(e[0] == NULL);
}

#endif

} // namespace base
